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Might be sticking my head out but I remember the 21 inch roundies are maximum rated at 25 KV. From what I remember, the 3A3 tends to overload and sag on bright scenes causing blooming.
Maybe a much stiffer high voltage supply (keep in mind pre war tv's and their ability to really ruin a persons day when ultor voltage goes to gound thru a human). It may be possible to wind a second filament winding on the flyback and run parallel 3A3's for more current. The only consideration here would be added dissipation in the primary of the high voltage stage and the ability of the regulator to control two 3A3's at one time.
I am looking for a suitable chassis to make a "Frankenset" right now. My girlfriend will probably have me committed if I do but..........
"What? No cabinet?!!!
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